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Monoatomic catalyst for preparation of low-carbon olefin by means of dehydrogenation of lower low-carbon hydrocarbons, and catalytic method

A low-carbon olefin and catalyst technology, applied in the direction of carbon compound catalysts, catalysts, hydrocarbons, etc., can solve the problems of large pollution, short life, high energy consumption, etc., to reduce costs and pollution, reduce metal consumption, and reduce reaction temperature Effect

Active Publication Date: 2019-01-18
北京博思福催化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems and defects of the prior art, the present invention provides a single-atom catalyst and catalytic method for the dehydrogenation of low-carbon hydrocarbons to low-carbon olefins, aiming to use a very small amount of metals and simple and easy-to-obtain carbon-nitrogen materials Or carbon materials as raw materials, while ensuring high catalytic performance, significantly reduce the reaction temperature, inhibit the formation of carbon deposits, and improve production efficiency; avoid the high cost, large pollution, high energy consumption, and short life of traditional industrial platinum and chromium catalysts And other issues

Method used

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  • Monoatomic catalyst for preparation of low-carbon olefin by means of dehydrogenation of lower low-carbon hydrocarbons, and catalytic method
  • Monoatomic catalyst for preparation of low-carbon olefin by means of dehydrogenation of lower low-carbon hydrocarbons, and catalytic method
  • Monoatomic catalyst for preparation of low-carbon olefin by means of dehydrogenation of lower low-carbon hydrocarbons, and catalytic method

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preparation example Construction

[0021] The preparation process of the catalyst of the present invention is as follows: the metal elements can be added to the corresponding metal precursors in the carrier preparation process through a one-pot method, or the carrier can be prepared first and then impregnated, precipitation, sol-gel, etc. The method loads active metal elements. The loading amount of metal elements and the composition of carrier elements can be controlled by adjusting factors such as raw material ratio, preparation temperature, preparation time and pyrolysis atmosphere.

[0022] The method for testing the catalytic performance of the single-atom catalyst provided by the present invention is as follows: the catalyst can be used to catalyze the dehydrogenation reaction of a variety of low-carbon hydrocarbons (such as isobutane, n-butane, butene, propane, ethane), In order to obtain the corresponding low-carbon olefins. The catalytic reaction is carried out in the reactor, and the composition of the ...

Embodiment 1

[0024] Example 1: Preparation of monoatomic chromium-supported nitrogen-doped carbon material catalyst. Dissolve 1.2mmol of chromium acetylacetonate and 12mmol of zinc nitrate in 120mL of methanol, and dissolve 72mmol of 2-methylimidazole in 120mL of methanol. After being fully dissolved, the 2-methylimidazole solution was added to the iridium acetylacetonate-zinc nitrate solution and stirred at room temperature for 24 hours. The solid product was obtained by centrifugal separation, washed with N,N'-dimethylformamide and methanol several times, dried in vacuum at 60°C for 24 hours, pyrolyzed in an argon atmosphere at 920°C for 3 hours and naturally cooled to room temperature. The monoatomic chromium-supported nitrogen-doped carbon material catalyst is prepared. After acidolysis of the catalyst, the mass loading of chromium measured by plasma emission spectroscopy (ICP-OES) is 0.14%, which is marked as Cr 1 / N-C (0.14%). Then evaluate the catalytic performance of the catalyst f...

Embodiment 2

[0025] Example 2: The monoatomic manganese-supported nitrogen-doped carbon material catalyst was prepared according to the method of Example 1, except that chromium acetylacetonate was replaced with manganese acetylacetonate. Measure the mass load of manganese and mark it as Mn 1 / N-C (0.64%); Then, the catalytic performance of the catalyst for the dehydrogenation of low-carbon hydrocarbons was evaluated.

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Abstract

The invention relates to a monoatomic catalyst for preparation of low-carbon olefin by means of dehydrogenation of low-carbon hydrocarbons, and a catalytic method. The catalyst is obtained by supporting metal active components, dispersed in an isolated monoatomic form, on a carrier, or supporting the metal active components on the carrier in a form in which single atoms and metal nanoparticles coexist. The metals in the metal active components are preferably selected from at least one of chromium, manganese, iron, cobalt, nickel, copper, gallium, molybdenum, ruthenium, rhodium, palladium, silver, iridium, platinum and lead; the carrier is prepared from one or more of a carbon-nitrogen material, a carbon material or oxides. The catalyst provided by the invention can realize the reduction ofmetal consumption and has very good stability; the catalyst can significantly reduce the reaction temperature while guaranteeing high catalytic performance, reduces the energy consumption, effectively avoids the formation of carbon deposit, and increases the production efficiency. The catalyst can catalyze a dehydrogenation reaction of the multiple low-carbon hydrocarbons such as isobutane, n-butane, butene, propane and ethane so as to produce corresponding low-carbon olefin products, thus being wide in application range; the monoatomic catalyst is multiple in preparation methods, wide in rawmaterials, low in cost and suitable for mass industrial production.

Description

Technical field [0001] The invention relates to a catalyst and a catalytic method for preparing low-carbon olefins by dehydrogenation of low-carbon hydrocarbons, and belongs to the technical field of petrochemical industry. Background technique [0002] Low-carbon olefins include isobutene, 1-butene, 2-butene, 1,3-butadiene, propylene, ethylene, etc. They are the basic raw materials of petrochemical industry and are widely used in the production of organic chemical raw materials, resin rubber plastics, and synthetic gasoline. Wait. In the traditional industrial production process, higher low-carbon olefins such as isobutene, 1-butene, 2-butene, 1,3-butadiene, and propylene are mainly obtained as by-products in the process of cracking ethylene in the petroleum industry, but in recent years With the improvement of shale gas steam cracking technology to produce ethylene, although the cost of ethylene has been significantly reduced, the process cannot obtain other high-grade olefins...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C5/333C07C11/09
CPCB01J27/24C07C5/333C07C5/3335C07C11/09C07C2527/24
Inventor 李亚栋陈晨李杨李治彭卿王定胜
Owner 北京博思福催化科技有限公司
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